165864067 has 2 divisors, whose sum is σ = 165864068. Its totient is φ = 165864066.

The previous prime is 165864059. The next prime is 165864071. The reversal of 165864067 is 760468561.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (760468561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165864067 - 2³ = 165864059 is a prime.

It is not a weakly prime, because it can be changed into another prime (165864367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82932033 + 82932034.

It is an arithmetic number, because the mean of its divisors is an integer number (82932034).

Almost surely, 2^165864067 is an apocalyptic number.

165864067 is a deficient number, since it is larger than the sum of its proper divisors (1).

165864067 is an equidigital number, since it uses as much as digits as its factorization.

165864067 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 165864067 is about 12878.8224228770. The cubic root of 165864067 is about 549.4364111135.

The spelling of 165864067 in words is "one hundred sixty-five million, eight hundred sixty-four thousand, sixty-seven".